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Ocsaar and CYP2C9 Ploymorphism, Is There a Connection Between Pharmacokinetics, Pharmacodynamics and Pharmacogenetics?

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified August 2008 by Assaf-Harofeh Medical Center.
Recruitment status was:  Not yet recruiting
Information provided by:
Assaf-Harofeh Medical Center Identifier:
First received: August 10, 2008
Last updated: August 11, 2008
Last verified: August 2008
Most Angiotensin receptor blocker's (ARBs) are metabolized by cytochrome P4502C9 (CYP2C9), one of the major isoforms of the cytochrome P450 in human liver microsome. The purpose of this study is to evaluate whether CYP2C9 polymorphism has a significant clinical influence on the blood pressure lowering effect of losartan and valsartan. Weather there is a genetic importance in choosing the right ARB for the right patient.

Condition Intervention
Drug: losartan
Drug: valsartan

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: Open Label
Official Title: Ocsaar and CYP2C9 Ploymorphism, Is There a Connection Between Pharmacokinetics, Pharmacodynamics and Pharmacogenetics?

Resource links provided by NLM:

Further study details as provided by Assaf-Harofeh Medical Center:

Primary Outcome Measures:
  • Blood pressure lowering effect of losartan and valsartan in patients with different CYP2C9 allels [ Time Frame: one month ]

Secondary Outcome Measures:
  • losartan/E-3174 ratio in different allelic groups of CYP2C9 [ Time Frame: one month ]

Estimated Enrollment: 30
Study Start Date: September 2008
Estimated Primary Completion Date: September 2009 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: 1
Hypertensive patients will be treated with losartan for one months
Drug: losartan
with losartan 50 mg once daily for one month
Drug: valsartan
valsartan 160 mg once daily
Experimental: 2
Hypertensive patients will be treated with valsartan
Drug: losartan
with losartan 50 mg once daily for one month
Drug: valsartan
valsartan 160 mg once daily

  Show Detailed Description


Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • The study will include 30 patients with the 3 most prevalent alleles of CYP2C9 *1, *2 and*3, 10 patients of each group.

Exclusion Criteria:

  • Patients treated with losartan or valsartan prior to their enrollment to the study,
  • Patients with BP below 140 systolic or 90 diastolic in an ambulatory 24 hours BP monitoring, acute coronary syndrome during the 6 months previous to the study,
  • Renal failure with creatinin levels above 1.5 mg/dL, hyperkalemia (K > 5 mg/dL),
  • Hematologic or solid malignancies or pregnancy.
  • Patients will also be excluded from the study if they are known to use one of the drugs inducing or inhibiting the CYP2C9, such as

    • rifampicin carbamazepine,
    • ethanol,
    • phenobarbitone,
    • fluconazole,
    • amiodarone,
    • trimethoprim,
    • fluvastatin,
    • cimetidine
    • chloramphenicol.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00732966

Contact: Ronit Koren Peleg, MD 972-524-535024
Contact: Ahuva Golik, Prof 972-577-345242

Sponsors and Collaborators
Assaf-Harofeh Medical Center
Principal Investigator: Ronit Koren Peleg, MD Department of Internal Medicine A , Research & Development unit Assaf Harofeh Medical Center, Zerifin, affiliated to Sackler School of Medicine, Tel Aviv, Israel
  More Information

Responsible Party: Koren Peleg Ronit MD, Assaf-Harofeh Medical Center internal medicine A Identifier: NCT00732966     History of Changes
Other Study ID Numbers: ronit3
Study First Received: August 10, 2008
Last Updated: August 11, 2008

Keywords provided by Assaf-Harofeh Medical Center:

Additional relevant MeSH terms:
Anti-Arrhythmia Agents
Antihypertensive Agents
Angiotensin II Type 1 Receptor Blockers
Angiotensin Receptor Antagonists
Molecular Mechanisms of Pharmacological Action processed this record on May 25, 2017